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ARM64: DT: define ARM64 specific arch_match_cpu_phys_id

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OF/DT core library provides architecture specific hook to match the
logical cpu index with the corresponding physical identifier.

On ARM64, the MPIDR_EL1 contains specific bitfields(MPIDR_EL1.Aff{3..0})
which uniquely identify a CPU, in addition to some non-identifying
information and reserved bits. The ARM cpu binding defines the 'reg'
property to only contain the affinity bits, and any cpu nodes with other
bits set in their 'reg' entry are skipped.

This patch overrides the weak definition of arch_match_cpu_phys_id
with ARM64 specific version using MPIDR_EL1.Aff{3..0} as cpu physical
identifiers.

Signed-off-by: Sudeep KarkadaNagesha <sudeep.karkadanagesha@arm.com>
Acked-by: Mark Rutland <mark.rutland@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
Sudeep KarkadaNagesha 2013-10-21 13:29:42 +01:00 committed by Catalin Marinas
parent c04e8e2fe5
commit 6e15d0e04b
1 changed files with 5 additions and 0 deletions
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5
arch/arm64/kernel/setup.c
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@ -98,6 +98,11 @@ void __init early_print(const char *str, ...)
printk("%s", buf);
}
bool arch_match_cpu_phys_id(int cpu, u64 phys_id)
{
return phys_id == cpu_logical_map(cpu);
}
static void __init setup_processor(void)
{
struct cpu_info *cpu_info;